Method for imparting elasticity or strength to paper or fabric



May 1934.

METHOD FOR IMPARTING ELASTICITY OR STRENGTH TO PAPER OR FABRIC 2Sheets-s 1 Filed April 6, 1932 i. I E===ES I NVENTQR.

H. JACKSON May 22, 1934.

METHOD FOR IMPARTING ELASTICITY OR STRENGTH TO PAPER OR FABRIC FiledApril 6, 1952 2 Sheets-Sheet 2 INVENTOR Patented May 22, 1934 METHOD FORIMPARTING ELASTICITY R STRENGTH T0 PAPER QR FABRIC Harold Jackson,Garstang, England Application April 6, 1932, Serial No. 603,601 In GreatBritain April 21,, 1931 3 Claims. (oi. i5i 3s) This invention relates toa method for treating webs or lengths of paper or fabric to secureelasticity or stretch crossways on the web of paper or fabric by meansof pleats or crinkles running 5 lengthways of the reel or length.

A paper has long been known which is crinkled transversely as it leavesa drying cylinder giving it stretch in a longitudinal direction.

To secure longitudinal pleating 0r crinkling on a reel or web of paperor fabric without impairing its strength to a serious extent it isessential that the edges of the web must converge i. e. the web becomesnarrower under treatment to the full extent of the length of paper takenup in the depth of the several corrugations. Thus if of elasticity orstretch, is required, the width of Web after treatment must beapproximately 20% less than before treatment. The stretch or elasticitythus corresponds with the amount the web 20 is narrowed and a greater orless stretchor elasticity may be obtained by a greater or less narrowingof the width of the web.

It has been proposed to secure stretch or elasticity crossways of apaper web by passing the web between two plain elastic belts which areallowed to contract from the feed to the delivery end but a web sotreated crinkles unevenly some of the crinkles or creases being muchlarger or wider than others.

The method according to the present invention consists in providing apositive crinkle 0r corrugation in the paper web by passing it betweentwo elastic longitudinally ribbed belts, expanding the beltstransversely at the feed end to flatten out the ribs and allowing themto contract pro- --gressively to the delivery end whereby the web isnarrowed and constrained to crinkle uniformly being pressed by the ribsof one belt into the grooves in the other.

In carrying out the invention the requisite narrowing of the web isobtained by passing it, preferably in a moist condition and preferablyas it leaves the rollers of the paper machine before drying between twoelastic ribbed belts, the ribs on one belt entering the grooves ontheother whereby the web is progressively narrowed and crinkleduniformly throughout its width.

The'invention will be fully described with reference to the accompanyingdrawings:-

Fig. 1 is a plan'of apparatus. Fig. 2 is an end view of feed end. Fig. 3is an end view of delivery end. 1 Fig. 4 is a longitudinal section online 4-4 of Fig. 1.

The aparatus comprises two rubber or elastic ribbed belts A, A1 withupstanding ribs a and alternating spaces or grooves (11 capable of beingexpanded or drawn out laterally to extend or widen the spaces or groovesa1 and reduce the, ribs 11 until the surface is approximately fiat orsmooth.

The bands A, A1 are gradually expanded laterally from the delivery endtowards the feed end where the web of paper enters between them bystenter clips on stenter chains B until they are approximately flat andcontract again towards the delivery end where the paper leaves them.

The damp paper enters between the two bands and rests upon the guides orribs a and as it travels forward with the bands and they are contractedthe paper is also gradually contracted in width and folded intolongitudinal pleats or crinkles within the grooves a1 between the ribsor guides a.

' The web of paper is much narrower and has a crinkled or corrugatedappearance longitudinally and it may be dried in this form or it may befirst passed between rollers and. the corrugations lightly pressed intopleats or folds.

The hereinbefore described method of imparting stretch or elasticity toa length of paper or fabric may be applied to plain or flat, or totransversely creped or crinkled paper when being manufactured on thepaper machine, or it may be applied to paper already made whether flator creped or crinkled transversely so as to secure stretch or elasticitylaterally or in both directions of the paper i. e.both length way andacross, and in this case the crinkles in the paper will cross oneanother at right angles.

What I claim as my invention and desire to protect by Letters Patent is:

1. A method of giving a positive crinkling longitudinally of 'a web ofpaper characterized by passing the web between two elasticlongitudinally ribbed belts, expanding the belts transversely at thefeed end to flatten out the ribs and allowing them to contractprogressively to the delivery end whereby the web is narrowed andconstrained to crinkle uniformly being pressed by the ribs of one beltinto the grooves in the other.

2. Mechanism for crinkling a web of paper longitudinally comprising twoelastic ribbed belts, ribs alternating with grooves on the surfacesthereof, the ribs on one belt entering the grooves 101 onthe other whenthe belts are travelling in one direction, stenter clips gripping bothedges of the belts by which they are stretched substantially flat at thefeed end and allowed to contract progressively to the delivery end, andconverging travelling eflxed.

chains to which the stenter clips ere 3. Mechanism for crinlzling e webof paper longitudinally comprising 13 We elestie riloheol belts,

ribs alternating with grooves on the surieees thereof, the ribs on onebelt entering the grooves on the other when the direction, stenter clipsgrip belts are travelling in one ping both edges oil the lllll

